ios – UITextField文本在左侧不滚动

我有一个UITextField子类,我已经覆盖了一些方法(参见下面的代码).问题是,当我输入它并且文本达到严格边距时,它将不再显示我正在键入的内容.在视图调试模式中,我看到UIFieldEditor比文本提交的要宽得多.

这是UITextFiled子类代码：

- (instancetype)init
{
    self = [super init];
    if (self) {
       self.edgeInsets = UIEdgeInsetsMake(7,10,15);
    }
    return self;
}

- (id)initWithFrame:(CGRect)frame{
    self = [super initWithFrame:frame];
    if (self) {
        self.edgeInsets = UIEdgeInsetsMake(7,15);
    }
    return self;
}

-(id)initWithCoder:(NSCoder *)aDecoder{
    self = [super initWithCoder:aDecoder];
    if(self){
        self.edgeInsets = UIEdgeInsetsMake(7,15);
    }
    return self;
}

- (CGRect)textRectForBounds:(CGRect)bounds {
    return [super textRectForBounds:UIEdgeInsetsInsetRect(bounds,self.edgeInsets)];
}

- (CGRect)editingRectForBounds:(CGRect)bounds {
    return [super editingRectForBounds:UIEdgeInsetsInsetRect(bounds,self.edgeInsets)];
}

这是我使用这个类的代码：

// alloc / init 
        _myTextField.delegate = self;
        _myTextField.backgroundColor = [UIColor whiteColor];
        _myTextField.layer.masksToBounds = YES;
        _myTextField.layer.cornerRadius = 3.0;
        _myTextField.returnKeyType = UIReturnKeyDone;
        _myTextField.clearButtonMode = UITextFieldviewmodeWhileEditing;
        _myTextField.autocapitalizationType = UITextAutocapitalizationTypeWords;
        _myTextField.autocorrectionType = UITextAutocorrectionTypeNo;
        _myTextField.hidden = YES;

        _tfButton = [UIButton buttonWithType:UIButtonTypeSystem];
        [_tfButton setimage:[UIImage imageNamed:@"ic_edit"] forState:UIControlStatenormal];
        [self fs_addSubview:_tfButton];
        [_tfButton constrainWidth:22.];
        [_tfButton setTintColor:[UIColor greenColor]];
        [_tfButton constrainHeight:22.];
        [_tfButton constrainToRightOfView:_myTextField margin:-25.0];
        [_tfButton constrainEqualCenterYWithView:_myTextField offset:0.0];
        [_tfButton setUserInteractionEnabled:NO];


        UIView *leftView = [[UIView alloc] initWithFrame:CGRectMake(0,5,5)];

        _myTextField.leftView = leftView;
        _myTextField.leftviewmode = UITextFieldviewmodeAlways;

当用户在此文本字段中键入大字符串时,如何让文本在左侧滚动？